{"product_id":"marine-thermostat-kit-for-yamaha-outboards-replaces-6e5-12411-30-00-and-688-12414-a1-00-fits-f15-f25-f30-f40-f50-f60-t9-9-t25-t50-t60-140f-60c-mpn-18-3611","title":"Sierra 18-3611 Thermostat Kit for Yamaha F15-F60, T9.9-T60 Outboards, Replaces 6E5-12411-30-00","description":"\u003cp\u003eThe Sierra 18-3611 Thermostat Kit is a complete cooling-system repair kit for compatible Yamaha outboard engines, pairing a 140 degree F (60 degree C) thermostat with its matching gasket in one package. The thermostat regulates engine coolant flow to keep the powerhead within its designed operating temperature range, opening at 140 degrees F to allow water flow once the engine reaches operating temperature and helping prevent overheating or over-cooling that can accelerate wear on internal components. The included gasket seals the thermostat housing to prevent coolant leaks after installation. Sierra engineers this kit to meet or exceed the specifications of the original equipment parts it replaces, and Sierra supplies OEM engine manufacturers and boat builders with parts on a daily basis, so the fit and function match what the engine was originally designed around. This kit fits a broad range of Yamaha outboard models, including the 15, F15, F25, F30, F40, F50, F60, F9.9, T25, T50, T60, and T9.9. Because thermostat failure is a common cause of overheating alarms and inconsistent engine temperature, replacing both the thermostat and gasket together, as this kit allows, is the recommended approach rather than reusing an old gasket. The kit is a straightforward maintenance item for routine cooling system service or as a repair when overheating symptoms appear.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3611\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Thermostat Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat Temperature Rating:\u003c\/strong\u003e 140 degrees F \/ 60 degrees C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e 1 thermostat (Sierra 18-3540), 1 gasket (Sierra 18-0844)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282265540\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eYamaha 15 (2006)\u003c\/li\u003e\n\u003cli\u003eYamaha F15 (1998-06)\u003c\/li\u003e\n\u003cli\u003eYamaha F25 (1999-06)\u003c\/li\u003e\n\u003cli\u003eYamaha F30 (2001-06)\u003c\/li\u003e\n\u003cli\u003eYamaha F40 (1999-06)\u003c\/li\u003e\n\u003cli\u003eYamaha F50 (1996-06)\u003c\/li\u003e\n\u003cli\u003eYamaha F60 (2002-06)\u003c\/li\u003e\n\u003cli\u003eYamaha F9.9 (2005-06)\u003c\/li\u003e\n\u003cli\u003eYamaha T25 (2001-06)\u003c\/li\u003e\n\u003cli\u003eYamaha T50 (1996-06)\u003c\/li\u003e\n\u003cli\u003eYamaha T60 (2003-06)\u003c\/li\u003e\n\u003cli\u003eYamaha T9.9 (2005-06)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e6E5-12411-30-00 (thermostat)\u003c\/li\u003e\n\u003cli\u003e688-12414-A1-00 (gasket)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature does the Sierra 18-3611 thermostat open at?\u003c\/strong\u003e It opens at 140 degrees F (60 degrees C), which is the temperature rating specified for the thermostat included in the Sierra 18-3611 kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-3611 kit?\u003c\/strong\u003e The kit contains one thermostat and one matching gasket, so you can replace both parts together during a single service on compatible Yamaha outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Yamaha outboard models does the 18-3611 thermostat kit fit?\u003c\/strong\u003e It fits the Yamaha 15 (2006), F15 (1998-06), F25 (1999-06), F30 (2001-06), F40 (1999-06), F50 (1996-06), F60 (2002-06), F9.9 (2005-06), T25 (2001-06), T50 (1996-06), T60 (2003-06), and T9.9 (2005-06).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this kit include the gasket, or do I need to buy it separately?\u003c\/strong\u003e The gasket is included in the Sierra 18-3611 kit along with the thermostat, so no separate gasket purchase is needed for a standard replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-3611 kit replace?\u003c\/strong\u003e The kit's components correspond to OEM numbers 6E5-12411-30-00 for the thermostat and 688-12414-A1-00 for the gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3611 an OEM part or an aftermarket equivalent?\u003c\/strong\u003e It is an aftermarket kit manufactured by Sierra, engineered to meet or exceed the specifications of the original equipment thermostat and gasket it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3611 thermostat kit weigh?\u003c\/strong\u003e The complete kit weighs 0.08 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this thermostat kit fit a Yamaha F50 outboard?\u003c\/strong\u003e Yes, the Sierra 18-3611 kit is listed as fitting the Yamaha F50 for model years 1996 through 2006.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the thermostat and gasket be replaced?\u003c\/strong\u003e Both parts in the 18-3611 kit are typically replaced together whenever the thermostat is serviced, since the gasket should not be reused once the housing has been opened.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3611 kit?\u003c\/strong\u003e The UPC is 808282265540.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit fit the Yamaha T9.9 outboard?\u003c\/strong\u003e Yes, the Sierra 18-3611 thermostat kit lists compatibility with the Yamaha T9.9 for model years 2005 through 2006.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand manufactures the 18-3611 thermostat kit?\u003c\/strong\u003e Sierra manufactures the 18-3611 thermostat kit.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988155183323,"sku":"SIE-18-3611","price":37.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3611_lg__62134.1558126251.500.750.jpg?v=1785188091","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-thermostat-kit-for-yamaha-outboards-replaces-6e5-12411-30-00-and-688-12414-a1-00-fits-f15-f25-f30-f40-f50-f60-t9-9-t25-t50-t60-140f-60c-mpn-18-3611","provider":"Good Vibes Marina","version":"1.0","type":"link"}